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<meta name="description" content="Time limit: 1000 ms Memory limit: 32768 kB  Description:一个规则的实心十二面体，它的 20个顶点标出世界著名的20个城市，你从一个城市出发经过每个城市刚好一次后回到出发的城市。  2019/3/31">
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          <h2 class="post-title" itemprop="name headline">HDU 2181 哈密顿绕行世界问题 (dfs)</h2>
        

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        <ul>
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<h4 id="Description"><a href="#Description" class="headerlink" title="Description:"></a>Description:</h4><p>一个规则的实心十二面体，它的 20个顶点标出世界著名的20个城市，你从一个城市出发经过每个城市刚好一次后回到出发的城市。</p>
<ul>
<li>2019/3/31  <a id="more"></a>
</li>
</ul>
<h4 id="Input"><a href="#Input" class="headerlink" title="Input"></a>Input</h4><p>前20行的第i行有3个数,表示与第i个城市相邻的3个城市.第20行以后每行有1个数m,m&lt;=20,m&gt;=1.m=0退出.</p>
<h4 id="Output"><a href="#Output" class="headerlink" title="Output"></a>Output</h4><p>输出从第m个城市出发经过每个城市1次又回到m的所有路线,如有多条路线,按字典序输出,每行1条路线.每行首先输出是第几条路线.然后个一个: 后列出经过的城市.参看Sample output</p>
<h4 id="Sample-Input"><a href="#Sample-Input" class="headerlink" title="Sample Input"></a>Sample Input</h4><figure class="highlight cpp"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br></pre></td><td class="code"><pre><span class="line"><span class="number">2</span> <span class="number">5</span> <span class="number">20</span></span><br><span class="line"><span class="number">1</span> <span class="number">3</span> <span class="number">12</span></span><br><span class="line"><span class="number">2</span> <span class="number">4</span> <span class="number">10</span></span><br><span class="line"><span class="number">3</span> <span class="number">5</span> <span class="number">8</span></span><br><span class="line"><span class="number">1</span> <span class="number">4</span> <span class="number">6</span></span><br><span class="line"><span class="number">5</span> <span class="number">7</span> <span class="number">19</span></span><br><span class="line"><span class="number">6</span> <span class="number">8</span> <span class="number">17</span></span><br><span class="line"><span class="number">4</span> <span class="number">7</span> <span class="number">9</span></span><br><span class="line"><span class="number">8</span> <span class="number">10</span> <span class="number">16</span></span><br><span class="line"><span class="number">3</span> <span class="number">9</span> <span class="number">11</span></span><br><span class="line"><span class="number">10</span> <span class="number">12</span> <span class="number">15</span></span><br><span class="line"><span class="number">2</span> <span class="number">11</span> <span class="number">13</span></span><br><span class="line"><span class="number">12</span> <span class="number">14</span> <span class="number">20</span></span><br><span class="line"><span class="number">13</span> <span class="number">15</span> <span class="number">18</span></span><br><span class="line"><span class="number">11</span> <span class="number">14</span> <span class="number">16</span></span><br><span class="line"><span class="number">9</span> <span class="number">15</span> <span class="number">17</span></span><br><span class="line"><span class="number">7</span> <span class="number">16</span> <span class="number">18</span></span><br><span class="line"><span class="number">14</span> <span class="number">17</span> <span class="number">19</span></span><br><span class="line"><span class="number">6</span> <span class="number">18</span> <span class="number">20</span></span><br><span class="line"><span class="number">1</span> <span class="number">13</span> <span class="number">19</span></span><br><span class="line"><span class="number">5</span></span><br><span class="line"><span class="number">0</span></span><br></pre></td></tr></table></figure>
<h4 id="Sample-Output"><a href="#Sample-Output" class="headerlink" title="Sample Output:"></a>Sample Output:</h4><figure class="highlight cpp"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br></pre></td><td class="code"><pre><span class="line"><span class="number">1</span>:  <span class="number">5</span> <span class="number">1</span> <span class="number">2</span> <span class="number">3</span> <span class="number">4</span> <span class="number">8</span> <span class="number">7</span> <span class="number">17</span> <span class="number">18</span> <span class="number">14</span> <span class="number">15</span> <span class="number">16</span> <span class="number">9</span> <span class="number">10</span> <span class="number">11</span> <span class="number">12</span> <span class="number">13</span> <span class="number">20</span> <span class="number">19</span> <span class="number">6</span> <span class="number">5</span></span><br><span class="line"><span class="number">2</span>:  <span class="number">5</span> <span class="number">1</span> <span class="number">2</span> <span class="number">3</span> <span class="number">4</span> <span class="number">8</span> <span class="number">9</span> <span class="number">10</span> <span class="number">11</span> <span class="number">12</span> <span class="number">13</span> <span class="number">20</span> <span class="number">19</span> <span class="number">18</span> <span class="number">14</span> <span class="number">15</span> <span class="number">16</span> <span class="number">17</span> <span class="number">7</span> <span class="number">6</span> <span class="number">5</span></span><br><span class="line"><span class="number">3</span>:  <span class="number">5</span> <span class="number">1</span> <span class="number">2</span> <span class="number">3</span> <span class="number">10</span> <span class="number">9</span> <span class="number">16</span> <span class="number">17</span> <span class="number">18</span> <span class="number">14</span> <span class="number">15</span> <span class="number">11</span> <span class="number">12</span> <span class="number">13</span> <span class="number">20</span> <span class="number">19</span> <span class="number">6</span> <span class="number">7</span> <span class="number">8</span> <span class="number">4</span> <span class="number">5</span></span><br><span class="line"><span class="number">4</span>:  <span class="number">5</span> <span class="number">1</span> <span class="number">2</span> <span class="number">3</span> <span class="number">10</span> <span class="number">11</span> <span class="number">12</span> <span class="number">13</span> <span class="number">20</span> <span class="number">19</span> <span class="number">6</span> <span class="number">7</span> <span class="number">17</span> <span class="number">18</span> <span class="number">14</span> <span class="number">15</span> <span class="number">16</span> <span class="number">9</span> <span class="number">8</span> <span class="number">4</span> <span class="number">5</span></span><br><span class="line"><span class="number">5</span>:  <span class="number">5</span> <span class="number">1</span> <span class="number">2</span> <span class="number">12</span> <span class="number">11</span> <span class="number">10</span> <span class="number">3</span> <span class="number">4</span> <span class="number">8</span> <span class="number">9</span> <span class="number">16</span> <span class="number">15</span> <span class="number">14</span> <span class="number">13</span> <span class="number">20</span> <span class="number">19</span> <span class="number">18</span> <span class="number">17</span> <span class="number">7</span> <span class="number">6</span> <span class="number">5</span></span><br><span class="line"><span class="number">6</span>:  <span class="number">5</span> <span class="number">1</span> <span class="number">2</span> <span class="number">12</span> <span class="number">11</span> <span class="number">15</span> <span class="number">14</span> <span class="number">13</span> <span class="number">20</span> <span class="number">19</span> <span class="number">18</span> <span class="number">17</span> <span class="number">16</span> <span class="number">9</span> <span class="number">10</span> <span class="number">3</span> <span class="number">4</span> <span class="number">8</span> <span class="number">7</span> <span class="number">6</span> <span class="number">5</span></span><br><span class="line"><span class="number">7</span>:  <span class="number">5</span> <span class="number">1</span> <span class="number">2</span> <span class="number">12</span> <span class="number">11</span> <span class="number">15</span> <span class="number">16</span> <span class="number">9</span> <span class="number">10</span> <span class="number">3</span> <span class="number">4</span> <span class="number">8</span> <span class="number">7</span> <span class="number">17</span> <span class="number">18</span> <span class="number">14</span> <span class="number">13</span> <span class="number">20</span> <span class="number">19</span> <span class="number">6</span> <span class="number">5</span></span><br><span class="line"><span class="number">8</span>:  <span class="number">5</span> <span class="number">1</span> <span class="number">2</span> <span class="number">12</span> <span class="number">11</span> <span class="number">15</span> <span class="number">16</span> <span class="number">17</span> <span class="number">18</span> <span class="number">14</span> <span class="number">13</span> <span class="number">20</span> <span class="number">19</span> <span class="number">6</span> <span class="number">7</span> <span class="number">8</span> <span class="number">9</span> <span class="number">10</span> <span class="number">3</span> <span class="number">4</span> <span class="number">5</span></span><br><span class="line"><span class="number">9</span>:  <span class="number">5</span> <span class="number">1</span> <span class="number">2</span> <span class="number">12</span> <span class="number">13</span> <span class="number">20</span> <span class="number">19</span> <span class="number">6</span> <span class="number">7</span> <span class="number">8</span> <span class="number">9</span> <span class="number">16</span> <span class="number">17</span> <span class="number">18</span> <span class="number">14</span> <span class="number">15</span> <span class="number">11</span> <span class="number">10</span> <span class="number">3</span> <span class="number">4</span> <span class="number">5</span></span><br><span class="line"><span class="number">10</span>:  <span class="number">5</span> <span class="number">1</span> <span class="number">2</span> <span class="number">12</span> <span class="number">13</span> <span class="number">20</span> <span class="number">19</span> <span class="number">18</span> <span class="number">14</span> <span class="number">15</span> <span class="number">11</span> <span class="number">10</span> <span class="number">3</span> <span class="number">4</span> <span class="number">8</span> <span class="number">9</span> <span class="number">16</span> <span class="number">17</span> <span class="number">7</span> <span class="number">6</span> <span class="number">5</span></span><br><span class="line"><span class="number">11</span>:  <span class="number">5</span> <span class="number">1</span> <span class="number">20</span> <span class="number">13</span> <span class="number">12</span> <span class="number">2</span> <span class="number">3</span> <span class="number">4</span> <span class="number">8</span> <span class="number">7</span> <span class="number">17</span> <span class="number">16</span> <span class="number">9</span> <span class="number">10</span> <span class="number">11</span> <span class="number">15</span> <span class="number">14</span> <span class="number">18</span> <span class="number">19</span> <span class="number">6</span> <span class="number">5</span></span><br><span class="line"><span class="number">12</span>:  <span class="number">5</span> <span class="number">1</span> <span class="number">20</span> <span class="number">13</span> <span class="number">12</span> <span class="number">2</span> <span class="number">3</span> <span class="number">10</span> <span class="number">11</span> <span class="number">15</span> <span class="number">14</span> <span class="number">18</span> <span class="number">19</span> <span class="number">6</span> <span class="number">7</span> <span class="number">17</span> <span class="number">16</span> <span class="number">9</span> <span class="number">8</span> <span class="number">4</span> <span class="number">5</span></span><br><span class="line"><span class="number">13</span>:  <span class="number">5</span> <span class="number">1</span> <span class="number">20</span> <span class="number">13</span> <span class="number">14</span> <span class="number">15</span> <span class="number">11</span> <span class="number">12</span> <span class="number">2</span> <span class="number">3</span> <span class="number">10</span> <span class="number">9</span> <span class="number">16</span> <span class="number">17</span> <span class="number">18</span> <span class="number">19</span> <span class="number">6</span> <span class="number">7</span> <span class="number">8</span> <span class="number">4</span> <span class="number">5</span></span><br><span class="line"><span class="number">14</span>:  <span class="number">5</span> <span class="number">1</span> <span class="number">20</span> <span class="number">13</span> <span class="number">14</span> <span class="number">15</span> <span class="number">16</span> <span class="number">9</span> <span class="number">10</span> <span class="number">11</span> <span class="number">12</span> <span class="number">2</span> <span class="number">3</span> <span class="number">4</span> <span class="number">8</span> <span class="number">7</span> <span class="number">17</span> <span class="number">18</span> <span class="number">19</span> <span class="number">6</span> <span class="number">5</span></span><br><span class="line"><span class="number">15</span>:  <span class="number">5</span> <span class="number">1</span> <span class="number">20</span> <span class="number">13</span> <span class="number">14</span> <span class="number">15</span> <span class="number">16</span> <span class="number">17</span> <span class="number">18</span> <span class="number">19</span> <span class="number">6</span> <span class="number">7</span> <span class="number">8</span> <span class="number">9</span> <span class="number">10</span> <span class="number">11</span> <span class="number">12</span> <span class="number">2</span> <span class="number">3</span> <span class="number">4</span> <span class="number">5</span></span><br><span class="line"><span class="number">16</span>:  <span class="number">5</span> <span class="number">1</span> <span class="number">20</span> <span class="number">13</span> <span class="number">14</span> <span class="number">18</span> <span class="number">19</span> <span class="number">6</span> <span class="number">7</span> <span class="number">17</span> <span class="number">16</span> <span class="number">15</span> <span class="number">11</span> <span class="number">12</span> <span class="number">2</span> <span class="number">3</span> <span class="number">10</span> <span class="number">9</span> <span class="number">8</span> <span class="number">4</span> <span class="number">5</span></span><br><span class="line"><span class="number">17</span>:  <span class="number">5</span> <span class="number">1</span> <span class="number">20</span> <span class="number">19</span> <span class="number">6</span> <span class="number">7</span> <span class="number">8</span> <span class="number">9</span> <span class="number">10</span> <span class="number">11</span> <span class="number">15</span> <span class="number">16</span> <span class="number">17</span> <span class="number">18</span> <span class="number">14</span> <span class="number">13</span> <span class="number">12</span> <span class="number">2</span> <span class="number">3</span> <span class="number">4</span> <span class="number">5</span></span><br><span class="line"><span class="number">18</span>:  <span class="number">5</span> <span class="number">1</span> <span class="number">20</span> <span class="number">19</span> <span class="number">6</span> <span class="number">7</span> <span class="number">17</span> <span class="number">18</span> <span class="number">14</span> <span class="number">13</span> <span class="number">12</span> <span class="number">2</span> <span class="number">3</span> <span class="number">10</span> <span class="number">11</span> <span class="number">15</span> <span class="number">16</span> <span class="number">9</span> <span class="number">8</span> <span class="number">4</span> <span class="number">5</span></span><br><span class="line"><span class="number">19</span>:  <span class="number">5</span> <span class="number">1</span> <span class="number">20</span> <span class="number">19</span> <span class="number">18</span> <span class="number">14</span> <span class="number">13</span> <span class="number">12</span> <span class="number">2</span> <span class="number">3</span> <span class="number">4</span> <span class="number">8</span> <span class="number">9</span> <span class="number">10</span> <span class="number">11</span> <span class="number">15</span> <span class="number">16</span> <span class="number">17</span> <span class="number">7</span> <span class="number">6</span> <span class="number">5</span></span><br><span class="line"><span class="number">20</span>:  <span class="number">5</span> <span class="number">1</span> <span class="number">20</span> <span class="number">19</span> <span class="number">18</span> <span class="number">17</span> <span class="number">16</span> <span class="number">9</span> <span class="number">10</span> <span class="number">11</span> <span class="number">15</span> <span class="number">14</span> <span class="number">13</span> <span class="number">12</span> <span class="number">2</span> <span class="number">3</span> <span class="number">4</span> <span class="number">8</span> <span class="number">7</span> <span class="number">6</span> <span class="number">5</span></span><br><span class="line"><span class="number">21</span>:  <span class="number">5</span> <span class="number">4</span> <span class="number">3</span> <span class="number">2</span> <span class="number">1</span> <span class="number">20</span> <span class="number">13</span> <span class="number">12</span> <span class="number">11</span> <span class="number">10</span> <span class="number">9</span> <span class="number">8</span> <span class="number">7</span> <span class="number">17</span> <span class="number">16</span> <span class="number">15</span> <span class="number">14</span> <span class="number">18</span> <span class="number">19</span> <span class="number">6</span> <span class="number">5</span></span><br><span class="line"><span class="number">22</span>:  <span class="number">5</span> <span class="number">4</span> <span class="number">3</span> <span class="number">2</span> <span class="number">1</span> <span class="number">20</span> <span class="number">19</span> <span class="number">18</span> <span class="number">17</span> <span class="number">16</span> <span class="number">15</span> <span class="number">14</span> <span class="number">13</span> <span class="number">12</span> <span class="number">11</span> <span class="number">10</span> <span class="number">9</span> <span class="number">8</span> <span class="number">7</span> <span class="number">6</span> <span class="number">5</span></span><br><span class="line"><span class="number">23</span>:  <span class="number">5</span> <span class="number">4</span> <span class="number">3</span> <span class="number">2</span> <span class="number">12</span> <span class="number">11</span> <span class="number">10</span> <span class="number">9</span> <span class="number">8</span> <span class="number">7</span> <span class="number">6</span> <span class="number">19</span> <span class="number">18</span> <span class="number">17</span> <span class="number">16</span> <span class="number">15</span> <span class="number">14</span> <span class="number">13</span> <span class="number">20</span> <span class="number">1</span> <span class="number">5</span></span><br><span class="line"><span class="number">24</span>:  <span class="number">5</span> <span class="number">4</span> <span class="number">3</span> <span class="number">2</span> <span class="number">12</span> <span class="number">13</span> <span class="number">14</span> <span class="number">18</span> <span class="number">17</span> <span class="number">16</span> <span class="number">15</span> <span class="number">11</span> <span class="number">10</span> <span class="number">9</span> <span class="number">8</span> <span class="number">7</span> <span class="number">6</span> <span class="number">19</span> <span class="number">20</span> <span class="number">1</span> <span class="number">5</span></span><br><span class="line"><span class="number">25</span>:  <span class="number">5</span> <span class="number">4</span> <span class="number">3</span> <span class="number">10</span> <span class="number">9</span> <span class="number">8</span> <span class="number">7</span> <span class="number">6</span> <span class="number">19</span> <span class="number">20</span> <span class="number">13</span> <span class="number">14</span> <span class="number">18</span> <span class="number">17</span> <span class="number">16</span> <span class="number">15</span> <span class="number">11</span> <span class="number">12</span> <span class="number">2</span> <span class="number">1</span> <span class="number">5</span></span><br><span class="line"><span class="number">26</span>:  <span class="number">5</span> <span class="number">4</span> <span class="number">3</span> <span class="number">10</span> <span class="number">9</span> <span class="number">8</span> <span class="number">7</span> <span class="number">17</span> <span class="number">16</span> <span class="number">15</span> <span class="number">11</span> <span class="number">12</span> <span class="number">2</span> <span class="number">1</span> <span class="number">20</span> <span class="number">13</span> <span class="number">14</span> <span class="number">18</span> <span class="number">19</span> <span class="number">6</span> <span class="number">5</span></span><br><span class="line"><span class="number">27</span>:  <span class="number">5</span> <span class="number">4</span> <span class="number">3</span> <span class="number">10</span> <span class="number">11</span> <span class="number">12</span> <span class="number">2</span> <span class="number">1</span> <span class="number">20</span> <span class="number">13</span> <span class="number">14</span> <span class="number">15</span> <span class="number">16</span> <span class="number">9</span> <span class="number">8</span> <span class="number">7</span> <span class="number">17</span> <span class="number">18</span> <span class="number">19</span> <span class="number">6</span> <span class="number">5</span></span><br><span class="line"><span class="number">28</span>:  <span class="number">5</span> <span class="number">4</span> <span class="number">3</span> <span class="number">10</span> <span class="number">11</span> <span class="number">15</span> <span class="number">14</span> <span class="number">13</span> <span class="number">12</span> <span class="number">2</span> <span class="number">1</span> <span class="number">20</span> <span class="number">19</span> <span class="number">18</span> <span class="number">17</span> <span class="number">16</span> <span class="number">9</span> <span class="number">8</span> <span class="number">7</span> <span class="number">6</span> <span class="number">5</span></span><br><span class="line"><span class="number">29</span>:  <span class="number">5</span> <span class="number">4</span> <span class="number">3</span> <span class="number">10</span> <span class="number">11</span> <span class="number">15</span> <span class="number">14</span> <span class="number">18</span> <span class="number">17</span> <span class="number">16</span> <span class="number">9</span> <span class="number">8</span> <span class="number">7</span> <span class="number">6</span> <span class="number">19</span> <span class="number">20</span> <span class="number">13</span> <span class="number">12</span> <span class="number">2</span> <span class="number">1</span> <span class="number">5</span></span><br><span class="line"><span class="number">30</span>:  <span class="number">5</span> <span class="number">4</span> <span class="number">3</span> <span class="number">10</span> <span class="number">11</span> <span class="number">15</span> <span class="number">16</span> <span class="number">9</span> <span class="number">8</span> <span class="number">7</span> <span class="number">17</span> <span class="number">18</span> <span class="number">14</span> <span class="number">13</span> <span class="number">12</span> <span class="number">2</span> <span class="number">1</span> <span class="number">20</span> <span class="number">19</span> <span class="number">6</span> <span class="number">5</span></span><br><span class="line"><span class="number">31</span>:  <span class="number">5</span> <span class="number">4</span> <span class="number">8</span> <span class="number">7</span> <span class="number">6</span> <span class="number">19</span> <span class="number">18</span> <span class="number">17</span> <span class="number">16</span> <span class="number">9</span> <span class="number">10</span> <span class="number">3</span> <span class="number">2</span> <span class="number">12</span> <span class="number">11</span> <span class="number">15</span> <span class="number">14</span> <span class="number">13</span> <span class="number">20</span> <span class="number">1</span> <span class="number">5</span></span><br><span class="line"><span class="number">32</span>:  <span class="number">5</span> <span class="number">4</span> <span class="number">8</span> <span class="number">7</span> <span class="number">6</span> <span class="number">19</span> <span class="number">20</span> <span class="number">13</span> <span class="number">12</span> <span class="number">11</span> <span class="number">15</span> <span class="number">14</span> <span class="number">18</span> <span class="number">17</span> <span class="number">16</span> <span class="number">9</span> <span class="number">10</span> <span class="number">3</span> <span class="number">2</span> <span class="number">1</span> <span class="number">5</span></span><br><span class="line"><span class="number">33</span>:  <span class="number">5</span> <span class="number">4</span> <span class="number">8</span> <span class="number">7</span> <span class="number">17</span> <span class="number">16</span> <span class="number">9</span> <span class="number">10</span> <span class="number">3</span> <span class="number">2</span> <span class="number">1</span> <span class="number">20</span> <span class="number">13</span> <span class="number">12</span> <span class="number">11</span> <span class="number">15</span> <span class="number">14</span> <span class="number">18</span> <span class="number">19</span> <span class="number">6</span> <span class="number">5</span></span><br><span class="line"><span class="number">34</span>:  <span class="number">5</span> <span class="number">4</span> <span class="number">8</span> <span class="number">7</span> <span class="number">17</span> <span class="number">18</span> <span class="number">14</span> <span class="number">13</span> <span class="number">12</span> <span class="number">11</span> <span class="number">15</span> <span class="number">16</span> <span class="number">9</span> <span class="number">10</span> <span class="number">3</span> <span class="number">2</span> <span class="number">1</span> <span class="number">20</span> <span class="number">19</span> <span class="number">6</span> <span class="number">5</span></span><br><span class="line"><span class="number">35</span>:  <span class="number">5</span> <span class="number">4</span> <span class="number">8</span> <span class="number">9</span> <span class="number">10</span> <span class="number">3</span> <span class="number">2</span> <span class="number">1</span> <span class="number">20</span> <span class="number">19</span> <span class="number">18</span> <span class="number">14</span> <span class="number">13</span> <span class="number">12</span> <span class="number">11</span> <span class="number">15</span> <span class="number">16</span> <span class="number">17</span> <span class="number">7</span> <span class="number">6</span> <span class="number">5</span></span><br><span class="line"><span class="number">36</span>:  <span class="number">5</span> <span class="number">4</span> <span class="number">8</span> <span class="number">9</span> <span class="number">10</span> <span class="number">3</span> <span class="number">2</span> <span class="number">12</span> <span class="number">11</span> <span class="number">15</span> <span class="number">16</span> <span class="number">17</span> <span class="number">7</span> <span class="number">6</span> <span class="number">19</span> <span class="number">18</span> <span class="number">14</span> <span class="number">13</span> <span class="number">20</span> <span class="number">1</span> <span class="number">5</span></span><br><span class="line"><span class="number">37</span>:  <span class="number">5</span> <span class="number">4</span> <span class="number">8</span> <span class="number">9</span> <span class="number">16</span> <span class="number">15</span> <span class="number">11</span> <span class="number">10</span> <span class="number">3</span> <span class="number">2</span> <span class="number">12</span> <span class="number">13</span> <span class="number">14</span> <span class="number">18</span> <span class="number">17</span> <span class="number">7</span> <span class="number">6</span> <span class="number">19</span> <span class="number">20</span> <span class="number">1</span> <span class="number">5</span></span><br><span class="line"><span class="number">38</span>:  <span class="number">5</span> <span class="number">4</span> <span class="number">8</span> <span class="number">9</span> <span class="number">16</span> <span class="number">15</span> <span class="number">14</span> <span class="number">13</span> <span class="number">12</span> <span class="number">11</span> <span class="number">10</span> <span class="number">3</span> <span class="number">2</span> <span class="number">1</span> <span class="number">20</span> <span class="number">19</span> <span class="number">18</span> <span class="number">17</span> <span class="number">7</span> <span class="number">6</span> <span class="number">5</span></span><br><span class="line"><span class="number">39</span>:  <span class="number">5</span> <span class="number">4</span> <span class="number">8</span> <span class="number">9</span> <span class="number">16</span> <span class="number">15</span> <span class="number">14</span> <span class="number">18</span> <span class="number">17</span> <span class="number">7</span> <span class="number">6</span> <span class="number">19</span> <span class="number">20</span> <span class="number">13</span> <span class="number">12</span> <span class="number">11</span> <span class="number">10</span> <span class="number">3</span> <span class="number">2</span> <span class="number">1</span> <span class="number">5</span></span><br><span class="line"><span class="number">40</span>:  <span class="number">5</span> <span class="number">4</span> <span class="number">8</span> <span class="number">9</span> <span class="number">16</span> <span class="number">17</span> <span class="number">7</span> <span class="number">6</span> <span class="number">19</span> <span class="number">18</span> <span class="number">14</span> <span class="number">15</span> <span class="number">11</span> <span class="number">10</span> <span class="number">3</span> <span class="number">2</span> <span class="number">12</span> <span class="number">13</span> <span class="number">20</span> <span class="number">1</span> <span class="number">5</span></span><br><span class="line"><span class="number">41</span>:  <span class="number">5</span> <span class="number">6</span> <span class="number">7</span> <span class="number">8</span> <span class="number">4</span> <span class="number">3</span> <span class="number">2</span> <span class="number">12</span> <span class="number">13</span> <span class="number">14</span> <span class="number">15</span> <span class="number">11</span> <span class="number">10</span> <span class="number">9</span> <span class="number">16</span> <span class="number">17</span> <span class="number">18</span> <span class="number">19</span> <span class="number">20</span> <span class="number">1</span> <span class="number">5</span></span><br><span class="line"><span class="number">42</span>:  <span class="number">5</span> <span class="number">6</span> <span class="number">7</span> <span class="number">8</span> <span class="number">4</span> <span class="number">3</span> <span class="number">10</span> <span class="number">9</span> <span class="number">16</span> <span class="number">17</span> <span class="number">18</span> <span class="number">19</span> <span class="number">20</span> <span class="number">13</span> <span class="number">14</span> <span class="number">15</span> <span class="number">11</span> <span class="number">12</span> <span class="number">2</span> <span class="number">1</span> <span class="number">5</span></span><br><span class="line"><span class="number">43</span>:  <span class="number">5</span> <span class="number">6</span> <span class="number">7</span> <span class="number">8</span> <span class="number">9</span> <span class="number">10</span> <span class="number">11</span> <span class="number">12</span> <span class="number">13</span> <span class="number">14</span> <span class="number">15</span> <span class="number">16</span> <span class="number">17</span> <span class="number">18</span> <span class="number">19</span> <span class="number">20</span> <span class="number">1</span> <span class="number">2</span> <span class="number">3</span> <span class="number">4</span> <span class="number">5</span></span><br><span class="line"><span class="number">44</span>:  <span class="number">5</span> <span class="number">6</span> <span class="number">7</span> <span class="number">8</span> <span class="number">9</span> <span class="number">16</span> <span class="number">17</span> <span class="number">18</span> <span class="number">19</span> <span class="number">20</span> <span class="number">1</span> <span class="number">2</span> <span class="number">12</span> <span class="number">13</span> <span class="number">14</span> <span class="number">15</span> <span class="number">11</span> <span class="number">10</span> <span class="number">3</span> <span class="number">4</span> <span class="number">5</span></span><br><span class="line"><span class="number">45</span>:  <span class="number">5</span> <span class="number">6</span> <span class="number">7</span> <span class="number">17</span> <span class="number">16</span> <span class="number">9</span> <span class="number">8</span> <span class="number">4</span> <span class="number">3</span> <span class="number">10</span> <span class="number">11</span> <span class="number">15</span> <span class="number">14</span> <span class="number">18</span> <span class="number">19</span> <span class="number">20</span> <span class="number">13</span> <span class="number">12</span> <span class="number">2</span> <span class="number">1</span> <span class="number">5</span></span><br><span class="line"><span class="number">46</span>:  <span class="number">5</span> <span class="number">6</span> <span class="number">7</span> <span class="number">17</span> <span class="number">16</span> <span class="number">15</span> <span class="number">11</span> <span class="number">10</span> <span class="number">9</span> <span class="number">8</span> <span class="number">4</span> <span class="number">3</span> <span class="number">2</span> <span class="number">12</span> <span class="number">13</span> <span class="number">14</span> <span class="number">18</span> <span class="number">19</span> <span class="number">20</span> <span class="number">1</span> <span class="number">5</span></span><br><span class="line"><span class="number">47</span>:  <span class="number">5</span> <span class="number">6</span> <span class="number">7</span> <span class="number">17</span> <span class="number">16</span> <span class="number">15</span> <span class="number">11</span> <span class="number">12</span> <span class="number">13</span> <span class="number">14</span> <span class="number">18</span> <span class="number">19</span> <span class="number">20</span> <span class="number">1</span> <span class="number">2</span> <span class="number">3</span> <span class="number">10</span> <span class="number">9</span> <span class="number">8</span> <span class="number">4</span> <span class="number">5</span></span><br><span class="line"><span class="number">48</span>:  <span class="number">5</span> <span class="number">6</span> <span class="number">7</span> <span class="number">17</span> <span class="number">16</span> <span class="number">15</span> <span class="number">14</span> <span class="number">18</span> <span class="number">19</span> <span class="number">20</span> <span class="number">13</span> <span class="number">12</span> <span class="number">11</span> <span class="number">10</span> <span class="number">9</span> <span class="number">8</span> <span class="number">4</span> <span class="number">3</span> <span class="number">2</span> <span class="number">1</span> <span class="number">5</span></span><br><span class="line"><span class="number">49</span>:  <span class="number">5</span> <span class="number">6</span> <span class="number">7</span> <span class="number">17</span> <span class="number">18</span> <span class="number">19</span> <span class="number">20</span> <span class="number">1</span> <span class="number">2</span> <span class="number">3</span> <span class="number">10</span> <span class="number">11</span> <span class="number">12</span> <span class="number">13</span> <span class="number">14</span> <span class="number">15</span> <span class="number">16</span> <span class="number">9</span> <span class="number">8</span> <span class="number">4</span> <span class="number">5</span></span><br><span class="line"><span class="number">50</span>:  <span class="number">5</span> <span class="number">6</span> <span class="number">7</span> <span class="number">17</span> <span class="number">18</span> <span class="number">19</span> <span class="number">20</span> <span class="number">13</span> <span class="number">14</span> <span class="number">15</span> <span class="number">16</span> <span class="number">9</span> <span class="number">8</span> <span class="number">4</span> <span class="number">3</span> <span class="number">10</span> <span class="number">11</span> <span class="number">12</span> <span class="number">2</span> <span class="number">1</span> <span class="number">5</span></span><br><span class="line"><span class="number">51</span>:  <span class="number">5</span> <span class="number">6</span> <span class="number">19</span> <span class="number">18</span> <span class="number">14</span> <span class="number">13</span> <span class="number">20</span> <span class="number">1</span> <span class="number">2</span> <span class="number">12</span> <span class="number">11</span> <span class="number">15</span> <span class="number">16</span> <span class="number">17</span> <span class="number">7</span> <span class="number">8</span> <span class="number">9</span> <span class="number">10</span> <span class="number">3</span> <span class="number">4</span> <span class="number">5</span></span><br><span class="line"><span class="number">52</span>:  <span class="number">5</span> <span class="number">6</span> <span class="number">19</span> <span class="number">18</span> <span class="number">14</span> <span class="number">15</span> <span class="number">11</span> <span class="number">10</span> <span class="number">9</span> <span class="number">16</span> <span class="number">17</span> <span class="number">7</span> <span class="number">8</span> <span class="number">4</span> <span class="number">3</span> <span class="number">2</span> <span class="number">12</span> <span class="number">13</span> <span class="number">20</span> <span class="number">1</span> <span class="number">5</span></span><br><span class="line"><span class="number">53</span>:  <span class="number">5</span> <span class="number">6</span> <span class="number">19</span> <span class="number">18</span> <span class="number">14</span> <span class="number">15</span> <span class="number">11</span> <span class="number">12</span> <span class="number">13</span> <span class="number">20</span> <span class="number">1</span> <span class="number">2</span> <span class="number">3</span> <span class="number">10</span> <span class="number">9</span> <span class="number">16</span> <span class="number">17</span> <span class="number">7</span> <span class="number">8</span> <span class="number">4</span> <span class="number">5</span></span><br><span class="line"><span class="number">54</span>:  <span class="number">5</span> <span class="number">6</span> <span class="number">19</span> <span class="number">18</span> <span class="number">14</span> <span class="number">15</span> <span class="number">16</span> <span class="number">17</span> <span class="number">7</span> <span class="number">8</span> <span class="number">9</span> <span class="number">10</span> <span class="number">11</span> <span class="number">12</span> <span class="number">13</span> <span class="number">20</span> <span class="number">1</span> <span class="number">2</span> <span class="number">3</span> <span class="number">4</span> <span class="number">5</span></span><br><span class="line"><span class="number">55</span>:  <span class="number">5</span> <span class="number">6</span> <span class="number">19</span> <span class="number">18</span> <span class="number">17</span> <span class="number">7</span> <span class="number">8</span> <span class="number">4</span> <span class="number">3</span> <span class="number">2</span> <span class="number">12</span> <span class="number">11</span> <span class="number">10</span> <span class="number">9</span> <span class="number">16</span> <span class="number">15</span> <span class="number">14</span> <span class="number">13</span> <span class="number">20</span> <span class="number">1</span> <span class="number">5</span></span><br><span class="line"><span class="number">56</span>:  <span class="number">5</span> <span class="number">6</span> <span class="number">19</span> <span class="number">18</span> <span class="number">17</span> <span class="number">7</span> <span class="number">8</span> <span class="number">9</span> <span class="number">16</span> <span class="number">15</span> <span class="number">14</span> <span class="number">13</span> <span class="number">20</span> <span class="number">1</span> <span class="number">2</span> <span class="number">12</span> <span class="number">11</span> <span class="number">10</span> <span class="number">3</span> <span class="number">4</span> <span class="number">5</span></span><br><span class="line"><span class="number">57</span>:  <span class="number">5</span> <span class="number">6</span> <span class="number">19</span> <span class="number">20</span> <span class="number">1</span> <span class="number">2</span> <span class="number">3</span> <span class="number">10</span> <span class="number">9</span> <span class="number">16</span> <span class="number">15</span> <span class="number">11</span> <span class="number">12</span> <span class="number">13</span> <span class="number">14</span> <span class="number">18</span> <span class="number">17</span> <span class="number">7</span> <span class="number">8</span> <span class="number">4</span> <span class="number">5</span></span><br><span class="line"><span class="number">58</span>:  <span class="number">5</span> <span class="number">6</span> <span class="number">19</span> <span class="number">20</span> <span class="number">1</span> <span class="number">2</span> <span class="number">12</span> <span class="number">13</span> <span class="number">14</span> <span class="number">18</span> <span class="number">17</span> <span class="number">7</span> <span class="number">8</span> <span class="number">9</span> <span class="number">16</span> <span class="number">15</span> <span class="number">11</span> <span class="number">10</span> <span class="number">3</span> <span class="number">4</span> <span class="number">5</span></span><br><span class="line"><span class="number">59</span>:  <span class="number">5</span> <span class="number">6</span> <span class="number">19</span> <span class="number">20</span> <span class="number">13</span> <span class="number">12</span> <span class="number">11</span> <span class="number">10</span> <span class="number">9</span> <span class="number">16</span> <span class="number">15</span> <span class="number">14</span> <span class="number">18</span> <span class="number">17</span> <span class="number">7</span> <span class="number">8</span> <span class="number">4</span> <span class="number">3</span> <span class="number">2</span> <span class="number">1</span> <span class="number">5</span></span><br><span class="line"><span class="number">60</span>:  <span class="number">5</span> <span class="number">6</span> <span class="number">19</span> <span class="number">20</span> <span class="number">13</span> <span class="number">14</span> <span class="number">18</span> <span class="number">17</span> <span class="number">7</span> <span class="number">8</span> <span class="number">4</span> <span class="number">3</span> <span class="number">10</span> <span class="number">9</span> <span class="number">16</span> <span class="number">15</span> <span class="number">11</span> <span class="number">12</span> <span class="number">2</span> <span class="number">1</span> <span class="number">5</span></span><br></pre></td></tr></table></figure>
<h3 id="题解"><a href="#题解" class="headerlink" title="题解"></a>题解</h3><ul>
<li>很明显这是一个深度优先的搜索问题</li>
</ul>
<h3 id="Source-Code"><a href="#Source-Code" class="headerlink" title="Source Code"></a>Source Code</h3><figure class="highlight cpp"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string">&lt;iostream&gt;</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string">&lt;cstring&gt;</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string">&lt;queue&gt;</span></span></span><br><span class="line"></span><br><span class="line"><span class="keyword">using</span> <span class="keyword">namespace</span> <span class="built_in">std</span>;</span><br><span class="line"></span><br><span class="line"><span class="keyword">int</span> city[<span class="number">30</span>][<span class="number">5</span>];<span class="comment">//用邻接表存储这个图</span></span><br><span class="line"><span class="keyword">int</span> ans[<span class="number">30</span>];<span class="comment">//存放路线</span></span><br><span class="line"><span class="keyword">int</span> no;</span><br><span class="line"><span class="keyword">int</span> visited[<span class="number">30</span>];<span class="comment">//用来标记城市是否已经被经历过</span></span><br><span class="line"><span class="keyword">int</span> root, count;<span class="comment">//开始的城市与经历过的城市数</span></span><br><span class="line"></span><br><span class="line"><span class="comment">//打印我们的答案</span></span><br><span class="line"><span class="function"><span class="keyword">void</span> <span class="title">print</span><span class="params">(<span class="keyword">int</span> ans[])</span></span>&#123;</span><br><span class="line">    <span class="built_in">cout</span> &lt;&lt; count &lt;&lt; <span class="string">":  "</span>;</span><br><span class="line">    <span class="keyword">for</span> (<span class="keyword">int</span> i = <span class="number">0</span>; i &lt; <span class="number">20</span>; i++)&#123;</span><br><span class="line">        <span class="built_in">cout</span> &lt;&lt; ans[i] &lt;&lt; <span class="string">" "</span>;</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="built_in">cout</span> &lt;&lt; root &lt;&lt; <span class="built_in">endl</span>;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="comment">//深度优先搜索</span></span><br><span class="line"><span class="function"><span class="keyword">void</span> <span class="title">dfs</span><span class="params">(<span class="keyword">int</span> c)</span></span>&#123;</span><br><span class="line">    visited[c] = <span class="number">1</span>;</span><br><span class="line">    ans[no] = c;</span><br><span class="line">    no++;</span><br><span class="line">    <span class="keyword">if</span> (no &lt;= <span class="number">19</span>)&#123;</span><br><span class="line">        <span class="keyword">for</span> (<span class="keyword">int</span> i = <span class="number">0</span>; i &lt; <span class="number">3</span>; i++)&#123;</span><br><span class="line">            <span class="keyword">if</span> (!visited[city[c][i]])</span><br><span class="line">                dfs(city[c][i]);<span class="comment">//不断访问下一个相邻的城市</span></span><br><span class="line">        &#125;</span><br><span class="line">    &#125; <span class="keyword">else</span> &#123;</span><br><span class="line">        <span class="keyword">for</span> (<span class="keyword">int</span> j = <span class="number">0</span>; j &lt; <span class="number">3</span>; j++)&#123;</span><br><span class="line">            <span class="comment">//判断是否能回到出发城市</span></span><br><span class="line">            <span class="keyword">if</span> (city[c][j] == root)&#123;</span><br><span class="line">                print(ans);</span><br><span class="line">                count++;</span><br><span class="line">                <span class="keyword">break</span>;</span><br><span class="line">            &#125;</span><br><span class="line"></span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line">    no--;</span><br><span class="line">    visited[c] = <span class="number">0</span>;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line"><span class="function"><span class="keyword">int</span> <span class="title">main</span><span class="params">()</span></span>&#123;</span><br><span class="line">    <span class="keyword">for</span> (<span class="keyword">int</span> i = <span class="number">1</span>; i &lt;= <span class="number">20</span>; i++)&#123;</span><br><span class="line">        <span class="built_in">cin</span> &gt;&gt; city[i][<span class="number">0</span>] &gt;&gt; city[i][<span class="number">1</span>] &gt;&gt; city[i][<span class="number">2</span>];</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line"></span><br><span class="line">    <span class="keyword">while</span> (<span class="built_in">cin</span> &gt;&gt; root &amp;&amp; root &gt; <span class="number">0</span> &amp;&amp; root &lt; <span class="number">21</span>)&#123;</span><br><span class="line"></span><br><span class="line">        <span class="built_in">memset</span>(visited, <span class="number">0</span>, <span class="keyword">sizeof</span>(visited) );</span><br><span class="line">        <span class="built_in">memset</span>(ans, <span class="number">0</span>, <span class="keyword">sizeof</span>(ans) );</span><br><span class="line">        no = <span class="number">0</span>;</span><br><span class="line">        count = <span class="number">1</span>;</span><br><span class="line">        dfs(root);</span><br><span class="line"></span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line"></span><br><span class="line">    <span class="keyword">return</span> <span class="number">0</span>;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

      
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